From 5e194bd8efe8dcd2fb6eaa13cec1a2a642c5254a Mon Sep 17 00:00:00 2001
From: Martino Facchin <m.facchin@arduino.cc>
Date: Wed, 6 Apr 2016 16:33:14 +0200
Subject: [AVR] Discover newer bootloader at runtime

Replaces #4280, only checks for the bootloader once

Tested with Hoodloader2, should work with every LUFA-derived bootloader released after 2014 (.apitable_signatures section must be placed at end of the flash)

BootloaderAPITable.S :

.global BootloaderAPI_Signatures
BootloaderAPI_Signatures:

    .long BOOT_START_ADDR ; Start address of the bootloader
    .word 0xDF00 ; Signature for the CDC class bootloader
    .word 0xDCFB ; Signature for a LUFA class bootloader

makefile:

BOOT_API_LD_FLAGS    += $(call BOOT_SECTION_LD_FLAG, .apitable_signatures,  BootloaderAPI_Signatures,  8)
---
 cores/arduino/USBCore.cpp | 7 +++++++
 1 file changed, 7 insertions(+)

(limited to 'cores/arduino/USBCore.cpp')

diff --git a/cores/arduino/USBCore.cpp b/cores/arduino/USBCore.cpp
index 62b90ed..3c7da86 100644
--- a/cores/arduino/USBCore.cpp
+++ b/cores/arduino/USBCore.cpp
@@ -35,6 +35,7 @@ extern const u8 STRING_PRODUCT[] PROGMEM;
 extern const u8 STRING_MANUFACTURER[] PROGMEM;
 extern const DeviceDescriptor USB_DeviceDescriptor PROGMEM;
 extern const DeviceDescriptor USB_DeviceDescriptorB PROGMEM;
+extern bool _updatedLUFAbootloader;
 
 const u16 STRING_LANGUAGE[2] = {
 	(3<<8) | (2+2),
@@ -806,6 +807,12 @@ void USBDevice_::attach()
 	UDIEN = (1<<EORSTE) | (1<<SOFE) | (1<<SUSPE);	// Enable interrupts for EOR (End of Reset), SOF (start of frame) and SUSPEND
 	
 	TX_RX_LED_INIT;
+
+#if MAGIC_KEY_POS != (RAMEND-1)
+	if (pgm_read_word(FLASHEND - 1) == NEW_LUFA_SIGNATURE) {
+		_updatedLUFAbootloader = true;
+	}
+#endif
 }
 
 void USBDevice_::detach()
-- 
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